Array Substrate TFT Doping Layout for Self-Heating Stability
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Solution Overview
Problem
Transistors with high mobility suffer from poor stability in operation.
Innovation Solution
An array substrate design that includes a first transistor with a specific doping structure, where the second doped sub-portion has a lower ion doping concentration than the first doped sub-portion, reducing voltage drop and improving stability by increasing resistance, thereby addressing self-heating issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transistors with high mobility are used, then performance is improved, but stability deteriorates due to self-heating
Solution Approach 1:
The patent applies local quality by creating a non-uniform doping concentration distribution within the doped portion of the active layer. Specifically, the doping concentration is designed to be higher near the drain electrode and lower near the source electrode, forming a gradient structure. This local variation in doping concentration allows different regions of the same component to serve different functions: the high-doping region near the drain reduces voltage drop and self-heating, while the low-doping region near the source maintains high carrier mobility for performance.
2Loss of energy
If doping concentration is increased to reduce resistance, then voltage drop decreases, but self-heating increases causing stability issues
Solution Approach 1:
The patent applies local quality by creating a non-uniform doping concentration distribution within the doped portion of the active layer. Specifically, the doping concentration is designed to be higher near the drain electrode and lower near the source electrode, forming a gradient structure. This local variation in doping concentration allows different regions of the same component to serve different functions: the high-doping region near the drain reduces voltage drop and self-heating, while the low-doping region near the source maintains high carrier mobility for performance.
3Ease of manufacture
If uniform doping concentration is used in doped portions, then manufacturing is simplified, but performance and stability cannot be simultaneously optimized
Solution Approach 1:
The patent applies local quality by creating a non-uniform doping concentration distribution within the doped portion of the active layer. Specifically, the doping concentration is designed to be higher near the drain electrode and lower near the source electrode, forming a gradient structure. This local variation in doping concentration allows different regions of the same component to serve different functions: the high-doping region near the drain reduces voltage drop and self-heating, while the low-doping region near the source maintains high carrier mobility for performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances the stability of transistors by reducing voltage drop and connection impedance, improving performance stability while maintaining high mobility.
Implementation Method 1
the resistance of the second doped sub-portion is greater than that of the first doped sub-portion, thereby reducing the voltage drop of the first doped portion connected to the drain, and improving the problem of poor stability of the first transistor due to self-heating
Data Source
Figure 1A~1D
Figure 1E~1G
Figure 1H~2
AI summary
An array substrate (10) includes a substrate (101) and a first transistor (T1) disposed thereon. The first transistor (T1) includes a first active layer (103), a first channel portion (1031), a first doped portion (1032), a second doped portion (1033), a first gate (105), a source (1081) and a drain (1082). The first doped portion (1032) and the second doped portion (1033) are connected to opposite ends of the first channel portion (1031), respectively. The first doped portion (1032) includes a first doped sub-portion (10321) and a second doped sub-portion (10322) connected between the first channel portion (1031) and the first doped sub-portion (10321). A doping concentration of ions in the second doped sub-portion (10322) is less than that in the first doped sub-portion (10321), and a doping concentration of ions in the first doped sub-portion (10321) is the same as that in the second doped portion (1033).